...In Japan, examples of arc-shaped deltas include the Tama River and the Obitsu River that flow into Tokyo Bay, and the delta of the Iwaki River (Aomori Prefecture) before it was reclaimed. On the other hand, when the action of the sea or lake is strong in front of the delta and the river also transports a lot of sediment, the delta becomes a pointed delta (also called a cusp delta) with its apex near the mouth of the main river. The Tiber River delta in Italy is a typical example. *Some of the terminology that refers to "cusp delta" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…日本でも,東京湾に注ぐ多摩川や小櫃川,干拓以前の岩木川(青森県)の三角州などが円弧状三角州の例としてあげられる。一方,三角州前面における海や湖の作用が強く,河川による土砂の運搬も盛んな場合には,主流の河口付近を頂点とした尖状三角州(カスプ状三角州ともいう)となる。イタリアのテベレ川三角州がその典型的なものである。… ※「カスプ状三角州」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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